Bump version to 7.3.28
Bump version to 7.3.28-dev
List @buttscicles with @wilkie; #722
Bump version to 7.3.29
Bump version to 7.3.29-dev
Fix tipping on GitHub org page; #816

The problem was that we were depending on the GitHub login being a
participant_id on Gittip, which used to be a fair assumption back when
GitHub was the only account elsewhere we supported. Now we have a layer
of indirection in there and we need to resolve GitHub accounts to Gittip
accounts before listing them. Fortunately GitHub gives us the full
user_info for each member of an org in the org listing API call, so we
don't need an extra HTTP request, though we do now make an extra db call
for each org member to update their info locally.
Bump version to 7.3.30
Bump version to 7.3.30-dev
Merge branch 'master' into username
Start branch.sql to fix username/id; #287, #680

This breaks pretty much everything, as promised:

    https://twitter.com/whit537/status/319426649479344128
    https://twitter.com/whit537/status/319493424917143552

:)
Get homepage working with username; #287, #680
Rename %participant_id dir to %username; #287
Add long id to security.txt, ht @dstufft
Bump version to 7.3.31
Bump version to 7.3.31-dev
Merge branch 'master' into username
Big changeover from id to username; #287

I sort of did this one with the blast shield down. I haven't even run
the tests yet. The sorts of things I changed:

 - SQL {elsewhere,exchanges}.participant_id => .participant
 - SQL participants.id => .username
 - ORM {user,participant,self}.id => .username
Started working through test failures; #287
Fix broken history links on history page
Bump version to 7.3.32